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The "http header ip"? The closest that HTTP has to an "ip" is the Host header which appears in HTTP 1.1, but that contains a host name more often than it contains an IP address. In addition there would generally be little point in changing it considering that the Host header is usually only used by the web server service once a TCP connection as already been made to the web server.

By "http header ip" do you actually mean the destination IP address in a HTTP request? (This is actually located in the IP header, not the HTTP header.)

What exactly are you trying to achieve?

Capitalisation is important. It's the difference between "Helping your brother Jack off a horse" and "Helping your brother jack off a horse".

Yes jupin is right ..but you could modify you ip headers using any packet analyzing manipulating tool and HTTP is application layer anf IP is network layer so manipulating aything in app layer dsnt change anything with nw layer